excess or markedly elevated pressure, especially a transient high pressure due to a shock wave
... or whether the bronchiectatic cavity is due principally to a yielding of the bronchial walls to the inspiratory and expiratory pressure, to the overpressure of the engorging secretion, ...1904, trans. unknown, Wilhelm von Leube, Julius L. Salinger (ed.), Medical Diagnosis, page 101
The walls facing the explosion will experience a reflected overpressure.1997, Task Committee on Blast Resistant Design, Design of Blast Resistant Buildings in Petrochemical Facilities, ASCE, page 3-14
1 more example
Figure 5-19 shows a breather valve that carries separately a direct-loaded vacuum relief value and an overpressure relief valve.2004, Peter Smith & R.W. Zappe, Valve Selection Handbook 5th ed, Elsevier, p191